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[3/4] drm/exynos: check crtc's dpms mode at page flip

Message ID 1347596981-12545-1-git-send-email-inki.dae@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Inki Dae Sept. 14, 2012, 4:29 a.m. UTC 
when page flip is requested, crtc's dpms mode should be on.
if not on, return -EPERM so that the hardware can't be accessed.
if user requesed dpms off and next page flip then the hardware
can be accessed with dpms off to enable vblank so this patch
will prevent from accessing the hardware with dpms off.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_crtc.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 8bd4d7e..5eda559 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -207,6 +207,12 @@  static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
 
 	DRM_DEBUG_KMS("%s\n", __FILE__);
 
+	/* when the page flip is requested, crtc's dpms should be on */
+	if (exynos_crtc->dpms > DRM_MODE_DPMS_ON) {
+		DRM_ERROR("failed page flip request.\n");
+		return -EPERM;
+	}
+
 	mutex_lock(&dev->struct_mutex);
 
 	if (event) {